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(No Model.)

P. ARMINGTON.

PISTON VALVE. No. 332,632. Patented Dec. 15, 1885.

llnrrnn STATES PATENT Fries.

PARDON ARMINGTON, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO THE ARMINGTON& SIMS ENGINE COMPANY, OF SAME PLACE.

PISTON-VALVE.

EPEC'JEFICATION forming part of Letters Patent No.332.632, datedDecember 15, 1885.

Application filed January 2, 1883. Serial No. 80,610.

(No model.)

Patented in England August 16, 18812, No. 3,914; in Italy September 4,1:82; in Sweden October 11, 18e2; in Austria October 13, 1882, No.28,161; in France November 14, 1882, No. 150,660; in Germany December30, 1882, No. 22,828 and No. 23,636; in Spain February 3, 1883; inNorway April 24, 1883,

and in Russia June 20, 18:54, No, 1,747.

To all whom it may concern.-

Be it known that I, PARDON ARMINe'roN, of the city and county ofProvidence,and State of Rhode Island, have invented a certain new 5 anduseful Improvement in Piston-Valves; and I hereby declare that thefollowing is a full, clear, and exact description of the same, referencebeing had to the accompanying drawings, forming part of thisspecification.

to This invention has reference to an improvement on my previousinvention, as set forth in Patent No. 214,160, granted to me July 12,1881, for an im'provenientin valves forsteamengines; and it consists inthe peculiar and :5 novel construction of the valve and valve chest,whereby the live steam surrounds the valve and is supplied to thecylinder from the center, while the exhaust escapes at the end of thevalve, as will be more fully set forth hereinafter.

Figure 1 is a top view of the steam-engine, showing the cylinder andvalve-chest in section. Fig. 2 is an enlarged sectional view of theenginecylinder and valve-chest.

In the drawings, A is the engine-cylinder; B, the piston; O, thecylindrical tubular valve; D, the valve-chest, and E the cover of thesame. F F are the exhaust-ports; g g, the passages communicating withthe ends of the cylinder. The valve 0 is of the same construction as thevalve shown and described in the previous patent herein referred to. Thecentral portion is of less diameter than the two ends. A passage isformed in the central 3 5 portion longitudinal to the axis of the valve,

which communicates with the annular openingS h h. V

The valve-case differs from the case in the former patent, in that thecentral portion is removed and the ends are constructed to form theexhaust-ports. By this change of construction the live steam at alltimes surrounds the valve, andthe exhaust-steam passes by the 7 end ofthe valve only. The temperature of the valve is thereby maintaineduniform, which was not the case in valves constructed as shown in theformer patent, in which,while the live steam was passing through theinterior of the valve, the exhaust-steam surrounded the valve, and bythe diii'erence in temperature condensed the live steam and affected theworking of the valve.

Another valuable advantage gained by this construction is that byremoving the cover E the valve and its ports can be clearly seen, the 55 valve can be accurately adjusted with the greatest nicety, so as toproduce the best result. This is of the highest possible importance andgreatly facilitates the setting of the valve, the operation of which canbe carefully watched when the balance-wheel is turned.

\Vhen properly adj usted, the cover E is secured, and the engine can bestarted up without any further adjustment.

The flow of the steam through the valve, as well as around the same, asalso the exhaust, is indicated by arrows in Fig. 2.

Having thus described my invention, I claim as new and desire to secureby Letters Iatent 7o 1. In a stcan'i-cngine, the combination, with thevalve C, constructed substantially as described, of two valve-casesconstructed to receive the two ends of the valve, and provided withport-openings and exhaust-passages, said exhaust-passages being locatedin alignment with the ends of the valve, and the latter being at alltimes exposed to the live steam, as described and shown.

2. The combination, with a tubular valve having annular openings neareach end, constructed to admit steam from the steam-chest to thecylinder at both ends of such valve simultaneously, of a valve-caseconstructed to receive the ends of the valve, but open in the center,and the cover E, the whole constructed to expose the valve to view andfacilitate the adjustment of the same, as described.

3. The combination, with a steam-engine cylinder, of a cylindrical valveconstructed go to control the admission and exhaust of the steam at bothends of the cylinder when the center of the valve is exposed to the livesteam only, and open to view for adjustment by the removal of the coverE of the valve-chest, as 5 described.

In witness whereof I have hereunto set my hand.

PARDON ARMINGTON.

Witnesses:

J. A. MILLER, Jr., M. F. BLIGH.

